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Steel Making

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer



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